Cita APA (7th ed.)

StataCorp LP. (2005). Stata base reference manual: Release 9. Stata Press.

Cita Chicago (17th ed.)

StataCorp LP. Stata Base Reference Manual: Release 9. College Station, Tex: Stata Press, 2005.

Cita MLA (9th ed.)

StataCorp LP. Stata Base Reference Manual: Release 9. Stata Press, 2005.